heidelberg



P. HEIDELBERG.

LAMP. APPLICATI-ON FILED .uov. 26. ms.

Patented Nov. 18, 1919.

2 SHEETS-SHEET I.

Fig.1.

P. HEIDELBEHG.

LAMP.

APPLICATION FILED NOV-26; I918.

Patented Nov. 18, 1919.

2 SHEETS-SHEET 2.

PAUL HEIDELBERG, 0F PARIS, FRANCE.

LAMP.

Specification of Letters Patent.

Patented Nov. 18, 1919.

Application filed November 26, 1918. Serial No. 264,210.

To all whom it may concern:

Be it known that I, PAUL HEIDEIBERG, a citizen of the French Republic, residing at ll rue du Colonel Bonnet, Paris, France, have invented new and useful Improvements in Lamps, of which the following is a specification.

My invention has for its object an acetylene lamp the flame of which burns steady in the open air and resists the wind without btiing inclosed or protected by glass, or the li re.

My lamp mainly consists of an open reflector having a parabolic surface and a metallic envelop or casing forming with the reflector a closed space except for an opening in the upper portion of the reflector situated over the burner. There is no chimney or other outlet for the products of combustion. The latter pass into the closed space and form with the air a cushion that resists any wind-pressure thus enabling the flame to burn steady though unprotected otherwise.

My invention is shown by way of example in the accompanying drawing in which:

Figure 1 shows the new lamp in cross section, while Fig. 2 is a front elevation.

The lamp consists of a parabolic surface AB-O of silver plated metal or other suitable material, placed inside a metallic envelop or casing DEFG, there being an open space between the latter and the reflector. Through the envelop and reflector passes a tube H soldered to the reflector and to the wall F-G of the casing to prevent all passage of air. The tube carries an acetylene burner 1, its other end J communicating with the generator.

The characteristic feature of my invention consists of the center of the flame being produced at the focus 0 of the parabole, at a distance of 0.03 of the summit, the corresponding distance of the section AC be ing 0 .27.

Above the burner an elliptic opening P is arranged in the reflector.

The face AB-C of the reflector is entire'ly open to the air, not being closed by glass, such as other lamps are. The edges are slightly bent over externally so as to permit of covering the apparatus with a hood R of rubber, leather or rubber sheeting, or waterproof material, or other material- (shown by the dotted lines in the drawing) to prevent dust from penetrating into the reflector when the burner is not lighted.

When the burner is lighted, the gas of the combustion escapes through the opening P and lodges in the closed space between the reflector and the envelop. The latter being absolutely hermetically closed, and the reflector having no other opening than. the opening P, from about 0*.05 to 0.10, there will be formed a cushion of air which resists wind, the flame remaining still.

- A certain amount of air is swallowed up in the reflector producing pressure; hence, the flame burns quietly due to the cushion of air being formed. There being no means for escape, the residues of the acetylene gas lodge in the small cavity arranged in the upper portion of the reflector.

The tube of the acetylene burner instead of passing through the lower part of the parabolic surface, can also pass through the upper part, in which case the flame is reversed.

The back E-F of the metallic envelop carries any kind of suitable device Q for attaching the lamp to the vehicle; such attaching device can be also provided, of course, on the sides of the envelop.

I claim as my invention:

1. A lamp comprising an open parabolic reflector, a casing forming a closed space with said reflector in communication therewith, and a burner arranged in said reflec tor.

2. A lamp as set forth in claim 1, in which there is provided in the reflector in line with the burner an opening for the escape of the gases into the closed space.

8. A lamp comprising an open parabolic reflector having an opening therein, a casing inclosing the back of the reflector forming a closed space therewith, a burner-tube passing through the said casing and reflector and carrying a burner in line with said opening, and means for closing the reflector.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PAUL HEIDELBERG.

Witnesses:

MARCEL GUILLEMOT, JOHN F. SIMoNs. 

